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Drag the items on the right into the middle to match with the items on the left.
echo
hertz
oscilloscope
wave length
frequency
amplitude
big amplitude
small amplitude
high frequency
low frequency
sound bouncing off hard surfaces
the number of waves per second
machine showing sound waves
distance between two waves
number of waves in one second
height  of a sound wave
loud sounds
quiet sounds
high pitch - squeaky sounds
low pitch - deep notes

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